no
9/4 is in its simplest form.
To 1/2
4/7
Well you would simplify it from 15/20 to 3/4 because you divide both the denominator and the numerator by 5. After that you divide 3 by 4 and you get 0.75. You could have also just divided 15 by 20 but it helps to simplify it first.
1 over 3
12 / 4 = 3
3/4
3/4
3/4
4/3
3 over 4
4 and 2/3
3/5 & 4/15 are already simplified.
If you simplify it, it's 105 and 3/4 (<--fraction).
3/4
4 and 1/2